These types of viruses and the workings of each virus:
1. File Anti-virus
This Virus has a way of working that infects an application or document that is in your computer. When the application of those infected are executed, then these viruses will spread by infecting all of the files or documents that are accessed by that application.
2. Boot Sector Virus
This Virus has a way of working which infects boot sectors disk (the boot sector is an area in which hard drive is accessed for the first time when the computer is turned on). If the boot sector virus is active, the user will not be booting his computer normally.
3. Virus E-mails
This Virus has a way of working that is spread through e-mail (usually in the form of file attachments/attachment). This type of Virus has a special feature in the form of extensions .SCR, .exe,. pif, or. bat.
If the Virus is active, then he will submit himself to different e-mail addresses contained in the user's address book.
4. the Multipartite Virus
This Virus has a way of working that infects computer files and boot sector on hard drive.
This type of Virus will cause a lot of problems because the cause of the damage is fatal.
5. Virus Polimorfis
This Virus has a unique way of working that this virus can alter the code itself (to exist) then spread itself to other computers. The Virus is more difficult to detect as it has nature/ability as it is.
6. Virus Stealth (stealth virus)
This Virus has a way of working that is he able to Hide themselves with how to make a infected file as if the file is not infected.
7. Virus Macros
This Virus has a way of working that infects Microsoft Office applications, such as Word and Excel.
Usually a Document infected by a Macro Virus will modify existing commands in Microsoft Office as the "Save" to spread himself when the command is run.